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nfsd: do nfs4_check_fh in nfs4_check_file instead of nfs4_check_olstateid 

Currently, preprocess_stateid_op calls nfs4_check_olstateid which
verifies that the open stateid corresponds to the current filehandle in the
call by calling nfs4_check_fh.

If the stateid is a NFS4_DELEG_STID however, then no such check is done.
This could cause incorrect enforcement of permissions, because the
nfsd_permission() call in nfs4_check_file uses current the current
filehandle, but any subsequent IO operation will use the file descriptor
in the stateid.

Move the call to nfs4_check_fh into nfs4_check_file instead so that it
can be done for all stateid types.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Cc: stable@vger.kernel.org
[bfields: moved fh check to avoid NULL deref in special stateid case]
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
steinar/wifi_calib_4_9_kernel
Jeff Layton 2015-07-30 06:57:46 -04:00 committed by J. Bruce Fields
parent 1ca4b88e7d
commit 8fcd461db7
1 changed files with 6 additions and 6 deletions
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12
fs/nfsd/nfs4state.c
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@ -4396,9 +4396,9 @@ laundromat_main(struct work_struct *laundry)
queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
}
static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
{
if (!fh_match(&fhp->fh_handle, &stp->st_stid.sc_file->fi_fhandle))
if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
return nfserr_bad_stateid;
return nfs_ok;
}
@ -4601,9 +4601,6 @@ nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
{
__be32 status;
status = nfs4_check_fh(fhp, ols);
if (status)
return status;
status = nfsd4_check_openowner_confirmed(ols);
if (status)
return status;
@ -4690,6 +4687,9 @@ nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
status = nfserr_bad_stateid;
break;
}
if (status)
goto out;
status = nfs4_check_fh(fhp, s);
done:
if (!status && filpp)
@ -4798,7 +4798,7 @@ static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_
status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
if (status)
return status;
return nfs4_check_fh(current_fh, stp);
return nfs4_check_fh(current_fh, &stp->st_stid);
}
/*